Coupled Analyses of Excavations in Saturated Soil
Publication: International Journal of Geomechanics
Volume 9, Issue 2
Abstract
This paper presents finite-element analyses of excavations by using a coupled deformation and flow formulation. Specific numerical procedures were implemented into the finite-element codes to simulate the excavation construction and to solve the nonlinear coupled system. The paper discusses results of two generic excavations, with analyses conducted using different constitutive models and different excavation rates. Although the constitutive model affected the magnitude and distribution of the excess of the pore-water pressure due to the excavation process, the constitutive models only slightly influenced the dissipation rate of the excess pore-water pressure. Excavation rates that were one order of magnitude smaller than the hydraulic conductivity of the soil led to results representative of drained processes. Because of the slow rate needed for drained conditions, partially drained conditions normally prevail during excavations, highlighting the importance of coupled analyses.
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Acknowledgments
The writers are grateful for the financial support received by the first writer from CAPES (Coordinating Agency for Advanced Training of High-Level Personnel—Brazil). They also acknowledge Professor John Whites and Harriet Reis for the editorial review of this text.
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Published In
International Journal of Geomechanics
Volume 9 • Issue 2 • March 2009
Pages: 73 - 81
Copyright
© 2009 ASCE.
History
Received: May 9, 2008
Accepted: Oct 15, 2008
Published online: Mar 1, 2009
Published in print: Mar 2009
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